editor, Cat Sharpe
[ASTD Press, ASTD Press], 1998
eBooks
McBride, John
BBC Books , 1996
Buku Teks SO
Barrass, Robert
Chapman and Hall, 1995
Buku Teks
Bennis, Warren G.
Addison-Wesley, [Date of publication not identified]
Buku Teks
Nadler, David A.
Addison-Wesley, 1977
Buku Teks